The state's two-year-old EV rebate program encourages the use of non-fossil-fuel-powered vehicles and has already paid cash rebates on 2,067 purchased or leased automobiles, Gov. Dannel P. Malloy said. The Chevy Bolt was the most popular brand this year with EV motorists.

Fuel cell powered EVs receive the largest cash rebate of $5,000. Plug-in hybrid and full battery electric EVs receive incentives ranging from $750 to $3,000, based on battery size.

The state Department of Energy and Environmental Protection (DEEP) oversees the EVConnecticut program. The program was originally established and funded through the merger of former Northeast Utilities, Eversource, and NSTAR in April 2012.

A DEEP spokesman said the $2 million is on top of $2.6 million added to the rebate program in October.

As previously reported, Connecticut and seven other states — California (which has been the clear leader in EV deployment), Maryland, Massachusetts, New York, Oregon, Rhode Island and Vermont — in 2013 committed to putting a combined 3.3 million electric vehicles on the road by 2025.